From 0a4078d4f3ac8a7d7cf13973d335307780db780b Mon Sep 17 00:00:00 2001
From: numzero <numzer0@yandex.ru>
Date: Tue, 11 Jun 2024 00:23:36 +0300
Subject: [PATCH] Join object hitting halves together

---
 src/bin/flat/main.rs | 36 +++++++++++++-----------------------
 1 file changed, 13 insertions(+), 23 deletions(-)

diff --git a/src/bin/flat/main.rs b/src/bin/flat/main.rs
index c9835fa..b8832ff 100644
--- a/src/bin/flat/main.rs
+++ b/src/bin/flat/main.rs
@@ -136,11 +136,6 @@ struct Hit {
 	rel: Ray, // в локальной ортонормированной СК объекта
 }
 
-struct HitInternal<'a> {
-	object: &'a Object,
-	distance: f32,
-}
-
 struct FlatTraceResult {
 	end: Option<Ray>,
 	objects: Vec<Hit>,
@@ -263,31 +258,26 @@ impl Space {
 		}).collect()
 	}
 
-	fn trace_to_objects(objs: &[Object], ray: Ray) -> Vec<HitInternal> {
+	fn hit_objects(objs: &[Object], ray: Ray, limit: f32, globalize: impl Fn(Vec2) -> Vec2) -> Vec<Hit> {
 		objs.iter()
 			.filter_map(|obj| {
 				let rel = ray.pos - obj.loc.pos;
 				let diff = rel.dot(ray.dir).powi(2) - ray.dir.length_squared() * (rel.length_squared() - obj.r.powi(2));
 				if diff > 0.0 {
 					let t = (-rel.dot(ray.dir) - diff.sqrt()) / ray.dir.length_squared();
-					if t >= 0.0 {
-						return Some(HitInternal { object: &obj, distance: t });
-					}
+					Some((obj, t))
+				} else {
+					None
 				}
-				None
-			}).collect()
-	}
-
-	fn hit_objects(objs: &[Object], ray: Ray, dist: f32, globalize: impl Fn(Vec2) -> Vec2) -> Vec<Hit> {
-		let hits = Self::trace_to_objects(objs, ray);
-		hits.into_iter().filter_map(|HitInternal { object, distance }|
-			if distance < dist {
-				let pos = ray.forward(distance).pos;
-				let rel = object.loc.rot.inverse() * (pos - object.loc.pos);
-				let dir = object.loc.rot.inverse() * ray.dir;
-				Some(Hit { id: object.id, distance, pos: globalize(pos), rel: Ray { pos: rel, dir } })
-			} else { None }
-		).collect()
+			})
+			.filter(|&(_, t)| t >= 0.0 && t < limit)
+			.map(|(obj, t)| {
+				let pos = ray.forward(t).pos;
+				let rel = obj.loc.rot.inverse() * (pos - obj.loc.pos);
+				let dir = obj.loc.rot.inverse() * ray.dir;
+				Hit { id: obj.id, distance: t, pos: globalize(pos), rel: Ray { pos: rel, dir } }
+			})
+			.collect()
 	}
 
 	fn line(&self, a: Vec2, b: Vec2, step: f32) -> Vec<Vec2> {